Lilly Rush is a Philadelphia police detective working for the department's homicide squad and being assinged 'cold cases'; crimes that have been commited many years ago and have not been solved. Lilly must try to re-think the crime scenes and interview other people involved with the victims to find a link to solving the cases.

A one-hour drama inspired by David Simon's acclaimed non-fiction book "Homicide: A Year on the Killing Streets." It is at once a mundane yet compelling look in and around a Homicide unit of the Baltimore Police Department, a group of determined individuals who are committed to their grim job at hand.